A handle attachment configured to provide a secure handle for a spray can and enable the operation of a dispenser valve of the spray can. The attachment includes a housing that defines a grip, a cap coupled to the housing, and an actuation device pivotally mounted to the housing. The cap has a C-shaped rim surrounding an opening that is sized to accommodate a valve mounting cup of the spray can. The rim has a lower portion in which a flange and slots are defined. The slots enable the lower portion of the rim to deflect radially outward relative to the remainder of the rim above the slots. The rigidity of the rim above its lower portion is increased with a ring that compresses the rim above the lower portion and/or a shoulder that defines an increased wall thickness of the cap above the lower portion.